Influence of Time and Temperature on the Regeneration of PtReIn/Al2O3 Naphtha Reforming Catalysts

Abstract

The influence of temperature (450-500 °C) and time (1-4 h) of coke combustion on the catalytic properties of PtReIn/Al 2 O 3 were studied. The results of the cyclohexane dehydrogenation and cyclopentane hydrogenolysis reactions show that the regeneration treatment with diluted oxygen can fully recover the activity of the metal function despite some observed segregation of Re and In. In the case of the n-heptane reforming reaction, the regenerated catalysts had lower activity and stability than the fresh ones. The experiments at high temperature in air showed that In prevents the sintering of Pt and Re but at 650 °C a segregation of Re from the Pt-Re phase occurs.

Regeneration study of Ni/hydroxyapatite spent catalyst from dry reforming

“…Vicerich et al [23] investigated the regeneration with oxygen diluted in nitrogen at 450-550°C of the PtReIn/Al 2 O 3 catalyst used in cyclohexane dehydrogenation and cyclopentane hydrogenolysis. They showed that the regeneration process could fully recover the activity of the spent catalyst.…”

Ring opening of decalin over bifunctional Ni–W carbide/Al2O3–USY catalysts and monofunctional acid Ni–W oxide/Al2O3–USY

“…Recently, the bifunctional catalysts 1,7,8,10,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] has been used in the ring opening of naphthenes which showed good performance because of its more acid sites and higher hydrogenation on metal sites. The studies about bifunctional catalysts mainly focused on some noble metal catalyst, 1,[8][9][10]12,[14][15][16][18][19][20][21][24][25][26][28][29][30][31] which are easier sulfur poisoning. 7,32,33 It is reported that transition metal carbide catalysts have shown excellent hydrogenation activity for hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) due to its higher hydrogenation on transition metal sites.…”

Improving Plasma Regeneration Conditions of Pt–Sn/Al2O3 in Naphtha Catalytic Reforming Process Using Atmospheric DBD Plasma System

“…Thus, the acidity of the catalyst is decreased. In addition, the long regeneration time of the deactivated catalysts by conventional methods is a disadvantage compared to the novel methods such as plasma regeneration [7]. Therefore, irreversible changes in the internal structure of catalysts in conventional methods highlight the requirement of alternative techniques, which is able to solve the thermal regeneration problems [8,9].…”